Stapling machine



FIG. 1 is a right front perspective view of a stapling machine showing my new design;

FIG. 2 is a right rear perspective view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a front elevational thereof; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a stapling machine, as shown and described. 